var fs = require("fs");

// 创建一个可读流
var readerStream = fs.createReadStream("input.txt");
// 创建一个可写流
var writerStream = fs.createWriteStream("output.txt");

// 管道读写操作，读取input.txt文件内容，并将内容写入到output.txt 文件中
readerStream.pipe(writerStream);


console.log("程序结束");
